Update!
I got to thinking about delaying Bangalore's culture gain, and I remembered I had one ICBM left over from centuries ago when I ICBM'd Persepolis.
FIRE ZE MISSILE!
This pushed Bangalore to like 25 turns til legendary. I expected this to give me an extra turn, and who knows I might get lucky. He might switch tiles because of the fallout or something weird.
I moved my airships and most of the nukes to the islands, while rushbuilding two ICBMs. Then on the island cities I rush built a sub and a transport.
And something weird did indeed happen.
REALLY?
GONNA PULL THIS **** GANDHI?
Apparently Hyderabad had almost exactly as much culture as Bangalore, and so Gandhi parked the GA there instead... and inland city.
Still I had five turns, and Delhi was 4 turns away. Now I just pray Gandhi has absolutely no idea how to use ships.
The next turn I opened with some air ship scouting and found this naval group (like 7 ships iirc) packed together. Perfect target for some ICBMS!
Darius still had a lot of navy ships parked by my islands and coast, from his attempted invasion of my continent. This was the game and I wasn't going to take any chances. Tactical nukes are something that are not in short supply here.
After nuking all of his ships, a bit of good news:
This gave me enough gold to rush buy some more!! And I got another sub / transport built, so I had 2 loaded subs, and 2 loaded transports (one inf each)
Gandhi still had an attack sub and a missile cruiser on his coast, so I couldn't dart with my ships yet. I moved my transport/subs one tile NW from the city. This made some minimal progress while staying outside of his ship range. Also I wanted to get out from that island in case it was nuked by the subs he had chilling to the south. And I hoped it my help lure his ships in to tat nuke range. Which it did !
Unfortunately Gandhi was in a real cheaty mood and decided to go from 5 turns left to 3 turns left.
There was no more time to delay, time to spring towards Delhi! I encountered a lone missile cruiser on the way. We know how to deal with those!
(I didn't take a screenshot at the time, so just now loaded a save and took one for y'all's benefit)
I moved the stack closer. I was entering blind territory at this point. Just had to pray Gandhi had no ships chilling by his capital.
They survived!!
This was it !!